code: def test_suffix(self):
      self.assertEqual(".json", io_utils.suffix("test.json"))
      self.assertEqual(".gz", io_utils.suffix("test.json.gz"))
      self.assertEqual("", io_utils.suffix("test"))
      self.assertEqual("", io_utils.suffix(".json"))
  
file_path: model-card-toolkit/model_card_toolkit/utils/io_utils_test.py
imports: import os
  import tempfile
  from absl.testing import absltest
  from model_card_toolkit.proto import model_card_pb2
  from model_card_toolkit.utils import io_utils
label_desc: Use image node_id 1 for calling the IoUtilsTest obj's underlying member method code with example usage: obj.test_suffix() without return types